H22a4 In A Prelude Si?

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It's pretty much right below the block. We had unbolted and removed the exhaust primary, but left the secondary. So we didn't even look at the O2 sensor. Duh.
 
Just curious but would the P72 add anything to the setup or is it pretty much just like putting in the P13. I mean, will it add any more horse, or get better mileage, you know, stuff like that.
 
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